Added XML validation and signup forms.

Summary:
Mergint with gh-pages

Implemented documentation for XML-feed. Still need to add the validation form (and possibly the signup form).

Implemented documentation for XML-feed. Still need to add the validation form (and possibly the signup form).

Arcanist is behaving weird. You'll probably get too many revisions.

Implemented documentation for XML-feed. Still need to add the validation form (and possibly the signup form).

Arcanist is behaving weird. You'll probably get too many revisions.

Validation form for validating XML-feeds with jobs

Validation form for validating XML-feeds with jobs

Merged changes from xml-doc

Did all changes that can be done before the API client becomes available.

Merge with gh-pages

Moved the JavaScript of the job module into the widgets dir.

Doing a commit so I can merge with gh-pages

Fixed conflicts

Styled the forms.

Almost done with validation

Test Plan: Test the forms. Test with valid and invalid XML documents. Test with D332.

Reviewers: #uitzendbureau.nl, claassen

Reviewed By: #uitzendbureau.nl, claassen

Differential Revision: http://phabricator.uzbdev.nl/D331